The Doctor explains that the Cybermen are threatening the Wheel, but the commander Bennett will not listen to him. The Cybermen hide themselves in a box of the much needed Bernalium fuel rods as Bennett questions how they will enter the station. Laleham and Vallance spacewalk back to the Wheel bringing the fuel rods and Cybermen with them. Bill arrives to help with the repairs to the X-Ray laser. Gemma speaks to the Doctor about her concerns for Bennett's mental health. Chang goes to fetch some fuel rods and is killed by a Cyberman. A Cyberman brings Bill under it's control. The Doctor deduces the Cybermen came aboard with the Bernalium. Tanya checks to see if any of the crew are under control of an outside force: Bill Duggan who has recently entered the room stands revealed. He attacks the communication equipment but is shot by Leo. The Doctor instructs Leo & Tanya in how to build jamming devices for the Cybermen's control. As the Doctor and Jamie investigate the loading bay a Cyberman appears....

This is a bit more like it, the Cybermen are on the station and up to something, but I think the damage has already been done by those first few episodes. I'm finding it difficult to care for the base crew at all.

The two Cybermen in this story have some Doctor Who connections: Jerry Holmes had an uncredited role as a Parisian man in The Massacre of St Bartholomew's Eve. Gordon Stothard is a regular extra at the time having already played a Robot Yeti in The Web of Fear, he'll be back in The Invasion and Mind of Evil. His Invasion appearance catches the eye of Toby Hadoke in "Running Down Corridors". He appears without disguise there and is seemingly the same actor that played Grun, the King's Champion, in The Curse of Peladon. That role is credited to Gordon St. Clair who has no other credits elsewhere and was never traced. If it's another actor appearing under a different name then that would explain it!